The amount of carbonic acid is conveniently found by introducing 100 c.c. of the _well-cooled_ beer into a rather large flask, provided with a delivery-tube which connects, first with a wash-bottle containing concentrated sulphuric acid, next with a U-tube, filled with fused calcium chloride. The latter is connected with a Liebig’s bulb containing a solution of potassium hydroxide, then with a U-tube containing solid potassium hydroxide, both of which have previously been tared. The flask is heated over a water-bath until the evolution of carbonic acid ceases, after which, the gas remaining in the apparatus is caused to traverse the potash bulb by drawing air through it. This is done by means of a tube attached to the flask and reaching below the surface of the beer. At its other extremity, it is drawn out to a fine point and connected with a small potash bulb (for the retention of atmospheric carbonic acid), by aid of a rubber tube, which permits of breaking the glass point before drawing air through the apparatus. The amount of carbonic acid present in the sample is ascertained by the increase of weight found in the larger potash bulb and U-tube. ALCOHOLOMETRIC TABLE FOR BEER, ETC. ---------+---------+------------------- Volume | Weight |Specific Gravity. per cent.|per cent.| ---------+---------+------------------ 1·0 | 0·80 | 0·99850 1·1 | 0·88 | 0·99835 1·2 | 0·96 | 0·99820 1·3 | 1·04 | 0·99805 1·4 | 1·12 | 0·99790 1·5 | 1·20 | 0·99775 1·6 | 1·28 | 0·99760 1·7 | 1·36 | 0·99745 1·8 | 1·44 | 0·99730 1·9 | 1·52 | 0·99715 2·0 | 1·60 | 0·99700 2·1 | 1·68 | 0·99686 2·2 | 1·76 | 0·99672 2·3 | 1·84 | 0·99658 2·4 | 1·92 | 0·99644 2·5 | 2·00 | 0·99630 2·6 | 2·08 | 0·99616 2·7 | 2·16 | 0·99602 2·8 | 2·24 | 0·99588 2·9 | 2·32 | 0·99574 3·0 | 2·40 | 0·99560 3·1 | 2·48 | 0·99546 3·2 | 2·56 | 0·99532 3·3 | 2·64 | 0·99518 3·4 | 2·72 | 0·99504 3·5 | 2·80 | 0·99490 3·6 | 2·88 | 0·99476 3·7 | 2·96 | 0·99462 3·8 | 3·04 | 0·99448 3·9 | 3·12 | 0·99434 4·0 | 3·20 | 0·99420 4·1 | 3·28 | 0·99406 4·2 | 3·36 | 0·99392 4·3 | 3·44 | 0·99378 4·4 | 3·52 | 0·99364 4·5 | 3·60 | 0·99350 4·6 | 3·68 | 0·99336 4·7 | 3·76 | 0·99322 4·8 | 3·84 | 0·99308 4·9 | 3·92 | 0·99294 5·0 | 4·00 | 0·99280 5·1 | 4·08 | 0·99267 5·2 | 4·16 | 0·99254 5·3 | 4·24 | 0·99241 5·4 | 4·32 | 0·99228 5·5 | 4·40 | 0·99215 5·6 | 4·48 | 0·99202 5·7 | 4·56 | 0·99189